探测由无人机产生的声干扰散射的雷达信号

IF 0.2 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Visnyk NTUU KPI Seriia-Radiotekhnika Radioaparatobuduvannia Pub Date : 2021-12-24 DOI:10.30837/rt.2021.4.207.12
V. Kartashov, V.A. Pososhenko, V. Kolesnik, I.S. Seleznjov, R.I. Bobnev, A. Kapusta
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引用次数: 0

摘要

研究了利用声辐射对无人机雷达进行监测的问题。结果表明,在许多实际情况下,这种方法比直接从无人机机身上使用雷达方法进行观测更可取。值得注意的是,由来自无人机的声包散射的无线电信号具有未知的预先复杂包络的特征,这不允许使用最佳滤波方法进行它们的检测和估计。为了解决这些问题,可以利用噪声波动和加性“信加噪声”混合的统计差异,将窄带随机过程的能量在观测区间内的积累原理简化为噪声色散。结果表明,降噪后的能量估计具有中心或偏离中心的“卡方”分布,具有一定数量的自由度,偏离中心参数大于或等于零。通过将无中心性参数的当前值与阈值进行比较,可以在最小的参数先验信息的情况下,对观测区间内有用信号的存在与否做出判断。值得注意的是,众所周知的中心和非中心卡方分布的微分概率密度表达式允许人们获得合成检测器的定性估计。提出了一种利用正交信道接收振荡处理的检测器的实用结构图。
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Detection of radar signals scattered by acoustic disturbances generated by UAVs
The problem of UAV radar monitoring by its acoustic radiation is considered. It is shown that in a number of practical cases such an approach is preferable to observation by radar methods directly from the UAV airframe. It is noted that the radio signals scattered by acoustic packets from the UAV are characterized by an unknown in advance complex envelope, which does not allow the use of optimal filtering methods for their detection and estimation. It is shown that to solve these problems, it is advisable to use the principle of accumulation over the observation interval of the energy of a narrow-band random process reduced to the noise dispersion, using the statistical differences between noise fluctuations and the additive "signal-plus-noise" mixture. It is shown that the energy estimate reduced to noise has either a central or an off-center "chi-square" distribution with a certain number of degrees of freedom and an off-center parameter greater than or equal to zero. As a result of comparing the current value of the no centrality parameter with the threshold value, a decision is made on the presence or absence of a useful signal in the observation interval with minimal a priori information about its parameters. It is noted that the well-known expressions for the differential probability densities of the central and non-central chi-square distributions allow one to obtain qualitative estimates of the synthesized detector. A practical structural diagram of a detector using processing of received oscillations in quadrature channels is proposed.
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Visnyk NTUU KPI Seriia-Radiotekhnika Radioaparatobuduvannia
Visnyk NTUU KPI Seriia-Radiotekhnika Radioaparatobuduvannia ENGINEERING, ELECTRICAL & ELECTRONIC-
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